Connect public, paid and private patent data with Google Patents Public Datasets

Delayed response disabling circuit for closed loop controlled internal combustion engines

Download PDF

Info

Publication number
US4186691A
US4186691A US05831061 US83106177A US4186691A US 4186691 A US4186691 A US 4186691A US 05831061 US05831061 US 05831061 US 83106177 A US83106177 A US 83106177A US 4186691 A US4186691 A US 4186691A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
fuel
control
signal
transistor
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05831061
Inventor
Sadao Takase
Masaharu Asano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1477Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/1481Using a delaying circuit

Abstract

A disabling circuit for a closed loop fuel controlled internal combustion engines of the type wherein fuel is completely cut off during deceleration includes a circuit for generating an electrical signal of a duration corresponding to the duration of fueld cut-off. A timing circuit respectively insensitive and sensitive to electrical signals of short and long durations derives a disabling signal which clamps the feedback signal to a suitable control voltage until the end of the electrical signal. The timing circuit is responsive to the end of the electrical signal to introduce a delay time to prolong the disabling signal and prevent the lean mixture fuel cut-off periods from adversely affecting control system when it resumes closed loop operation.

Description

FIELD OF THE INVENTION

The present invention relates generally to closed loop fuel control systems for internal combustion engines and in particular to a fuel control system for an internal combustion engine of the type provided with a means for cutting off fuel supply during deceleration in which the fuel control system is disabled in delayed response to the fuel cut-off operation.

CROSS-REFERENCE TO PRIOR ART

U.S. patent application Ser. No. 734,115, filed Oct. 20, 1976, U.S. Pat. No. 4,123,999.

BACKGROUND OF THE INVENTION

In a closed loop fuel control system, the air-fuel ratio of the post combustion gases is sensed by an exhaust gas sensor to derive a feedback control signal which is used to control the ratio of air to fuel prior to combustion so that the air-fuel ratio of the exhaust gases is controlled within a narrow range of air-fuel ratios where the efficiency of three-way catalytic conversion is at a maximum.

In internal combustion engines of the type which completely cut off fuel supply during deceleration, the closed loop fuel control sense a lean condition which results in an enrichment signal during the fuel cut-off period. In response to the enrichment signal, the system supplies an excessively rich mixture at the instant when the fuel supply is restarted so that the air-fuel ratio within the exhaust system drifts from the desired range. It is therefore desirable to disable the closed loop fuel control during such fuel cut-off periods. However, a momentary throttling operation during transmission gear changes may be erroneously sensed as a deceleration to cut off the fuel. If the closed loop control is disabled during such operation, the system will oscillate abnormally.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a fuel control system for an internal combustion engine of the type provided with means to completely cut off the fuel supply during deceleration, wherein the control system is disabled so it is insensitive to a brief fuel cut-off operation and sensitive to a fuel cut-off operations which persist for a longer interval.

Another object of the invention is to provide a fuel control system wherein the closed loop control is disabled for an extended period of time from the end of fuel cut-off operation to prevent the lean mixture during the fuel cut-off period from adversely affecting the closed loop control when it resumes after the fuel supply is restarted.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be further described with reference to the accompanying drawings, in which:

FIG. 1 is a schematic illustration of an embodiment of the invention;

FIG. 2 is a circuit diagram of a part of the embodiment of FIG. 1;

FIG. 3 is a waveform diagram useful for describing the operation of the circuit of FIG. 2;

FIG. 4 is a modification of the embodiment of FIG. 1;

FIG. 5 is a waveform diagram useful for describing the operation of the circuit of FIG. 4; and

FIG. 6 is a modification of the integral controller of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to FIG. 1, a closed loop mixture control system embodying the invention is illustrated. The internal combustion engine 11 is supplied with air through an intake pipe (not shown) and fuel from injector 10 in a controlled air-fuel ratio. In the exhaust pipe is provided an exhaust gas sensor 12 upstream from a three-way catalytic converter 13. Catalytic converter 13 is a device of the type in which exhaust gases flowing therethrough are exposed to a catalytic substance which, given the proper air-fuel ratio in the exhaust gases, promotes simultaneous oxidation of carbon monoxide and hydrocarbons and reduction of oxides of nitrogen. The exhaust gas sensor 12 is an oxygen sensor of the zirconia electrolyte type which, when exposed to engine exhaust gases at high temperatures, generates an output voltage which changes appreciably as the air-fuel ratio of the exhaust gases passes through the stoichiometric level. The output voltage of the sensor 12 is a function of air-fuel ratio determined by the fuel injector 10 and exhibits a fairly steep slope as the mixture passes through stoichiometry.

The output from the oxygen sensor 12 is fed into a closed loop mixture control unit 14 to generate a signal which is used to correct the air-fuel ratio to a desired value where the efficiency of three-way catalytic conversion is at a maximum.

As shown in detail in FIG. 2, the control unit 14 includes a differential amplifier 15 which computes the difference between the sensor output and a reference V1, which difference is supplied to an integral controller 16 comprised of an operational amplifier 17 having a noninverting input connected to a given DC potential and an inverting input connected to its output by means of an integrating capacitor C1 and to the output of the differential amplifier 15 by a resistor R1. The capacitor C1 is connected in parallel with a trasistor switch 18 which provides a low resistance discharge path across the capacitor C1 in response to a signal applied to the transistor control gate.

A fuel injection electronic control unit 20 of the conventional design (FIG. 1) receives various engine operating parameters, including throttle position, to determine the duration of injection pulses supplied to injector 10 so that the opening time of the injector is controlled. Consequently the quantity of fuel supplied to engine 11 is varied in response to the various engine operating parameters unit 20 is designed to cut off fuel in response to particular engine operating parameters, such as nearly closed throttle position and engine R.P.M indicating deceleration of the engine. The output from the integral controller 16 is applied to the electronic control unit 20 to modify or correct the width of the injection pulse in accordance with the sensed air-fuel ratio.

A closed loop control disabling circuit 21 is provided which receives its input signal from the electronic control unit 20. The disabling circuit 21 includes as shown in FIG. 2, a transistor 22 having a base connected to the output of the control unit 20. The emitter of transistor 22 is connected to ground by a series circuit including resistor R2 and capacitor C2 which is charged by current supplied from voltage source Vcc through the collector-emitter path of transistor 22. The base electrode of transistor 23 is connected to the junction of resistor R2 and capacitor C2 by resistor R3. The emitter and collector of transistor 23 are respectively connected to ground and by resistor R4 to the voltage source Vcc. Resistor R3 is selected to have a value larger than that of resistor R2 so that capacitor C2 is charged at a higher rate than it is discharged. The collector of transistor 23 is connected to ground by a series circuit including a resistor R5 and a capacitor C3. The noninverting input of a comparator 24 is connected to the junction between the resistor R5 and capacitor C3, the inverting input of the comparator being connected to a reference voltage V2 supplied from the junction of a series-connected resistors R6 and R7. The output of the comparator 24 is connected to the control gate of the transistor switch 18 of the closed loop fuel control circuit 14.

The operation of the circuit of FIG. 2 will be comprehended by reference to the waveform shown in FIG. 3. It is assumed that fuel cut-off operation is effected during time interval t1 to t2 so that injection pulses are applied to the base electrode of transistor 22 of the disabling circuit 21 during time interval to to t1 and after time t2 as shown in FIG. 3A. In response to the injection pulses, the transistor 22 is switched on and off and charges the capacitor C2 through resistor R2 so that the voltage across capacitor C2 rapidly rises in response to the conduction of transistor 22 and discharges gradually in response to the nonconduction of transistor 22 through resistor R3 as illustrated in FIG. 3B. When the injection pulses occur successively, the capacitor C2 will be charged again before the voltage across it drops below the threshold level of the transistor 23 so that transistor 23 is in the conductive state which provides a shunt across the circuit including resistor R5 and capacitor C3. When the fuel cut-off operation occurs and consequently no injection pulses are applied to the base of transistor 22, the voltage across capacitor C2 falls below the threshold voltage of transistor 23 as indicated at V3 in FIG. 3B, causing transistor 23 to be switched to the nonconductive state at time t1. With the turn-off of transistor 23, capacitor C3 is charged by current through resistors R4 and R5 so that the voltage across the capacitor C3 gradually increases at a rate determined by the time constant (R4+R5) C3, as illustrated in FIG. 3C. The comparator 24 is switched to the high output state when voltage V2 is reached at time t1 ', generating a disabling signal 25 (FIG. 3D) which is coupled to the control gate of the switching transistor 18 so that the integrating capacitor C1 is instantly discharged. Therefore, controller 16 ceases its integration function and the closed loop control is disabled from time t1 '.

At time t2, the injection pulse is applied again to the base of transistor 22, causing it to conduct and charge capacitor C2 to turn on transistor 23. The turn-on of transistor 23 causes capacitor C3 to discharge through resistor R5 and through the conducting path of transistor 23 to ground so that the voltage across capacitor C3 drops at a rate determined by the time constant R5C3. The comparator 24 will then be switched to the low output state when the voltage across capacitor C3 falls below voltage V2 at time t2 '. Therefore, the disabling of closed loop control takes place at time t1 ' after the elapse of a delay interval T1 that begins at time t1. Closed loops control is re-enabled at time t2 ' after the elapse of a delay interval T2, that begins at time t2, as shown in FIG. 3D. In delayed response to fuel cut-off, the mixture is leaned resulting in a low voltage from the oxygen sensor 12 and the closed loop control is disabled to prevent it from generating an enrichment signal which would otherwise cause the engine to be excessively enriched when the closed loop control resumes operation. This delayed disabling operation has further advantages. When the driver manipulates the clutch pedal for changing transmission gears while at the same time attempting to accelerate the vehicle, the throttle valve is nearly closed to prevent the engine from running at high speeds due to the disengagement from transmission. The nearly closed position of the throttle commands the fuel injection control unit 20 to effect fuel cut-off operation. Such fuel cut-off operation may last for a period of three to four seconds. If the time interval T1 is selected at a value larger than the interval during which the fuel cut-off of the type above-described occurs, the closed loop fuel control is not disabled to thereby avoid the the introduction of an unnecessary, sudden change of air-fuel ratio. The introduction of delay time T2, on the other hand, allows the lean mixture, inducted immediately prior to time t2, to reach the oxygen sensor 12 during the delayed time interval T2 so that the resumption of closed loop fuel control operation at time t2 ' permits the control system to produce a signal which reflects the air-fuel ratio of the mixture inducted at a time subsequent to time t2, rather than that of the mixture inducted prior to time t2. Therefore, the length of time interval t2 should be slightly longer than the transport time of the mixture from the time of induction to the time of sensing of the oxygen component in the exhaust gases by the sensor 12.

In FIG. 4 a modification of the disabling circuit of FIG. 2 is shown as including a transistor 30 having its base connected to the collector of transistor 23 of FIG. 2 and a monostable multivibrator 31 having its input connected to the collector of transistor 23 and its output connected to the base of a transistor 32. The collector of transistor 30 is connected by a resistor R9 to the base of transistor 32 and the collector of transistor 32 is connected to the control gate of switching transistor 18 of the integral controller 16. A voltage source is coupled to the collector of transistors 30 and 32 through respective load resistors R8 and R10 and through the respective collector-emitter paths to ground. The waveform shown in FIG. 5A represents the potential at the collector of transistor 23 of FIG. 2. The monostable 31 generates a pulse 33 of a duration of T1 in FIG. 5B in response to the leading edge of the output from transistor 23. During the time interval t1 to t2, the transistor 30 is turned on so that its collector potential is at low voltage level which turns off transistor 32. However, the presence of the pulse 33 at the base of transistor 32 biases it into conduction until time t1 ', whereby transistor 32 is turned off during time interval t1 ' to t2 and during this time interval the collector potential of transistor 32 is at a high voltage level as shown in FIG. 5c. The switching transistor 18 is thus biased into conduction during this time interval. It will be appreciated that if a fuel cut-off operation occurs in a brief period of time shorter than time interval T1, transistor 32 provides no disabling signal so that the disabling circuit 21 is insensitive to a momentary cut-off during transmission gear changes.

In FIG. 6 is shown a modification of the integral controller 16 of the previous embodiment in which a resistor R11 is provided in series with the transistor switch 18 and an electronic switch 40 is provided to normally couple the signal from differential amplifier 15 to the inverting input of operational amplifier 17 and couple a DC potential from the tap point of a variable resistor VR to the inverting input in response to the output from the disabling circuit 21. During the closed loop disabling operation, the output from the integral controller 16 is held at a constant voltage which may be chosen at an appropriate value by adjustment of variable resistor VR so that the air-fuel ratio may be controlled at a correspondingly appropriate value that minimizes the amount of noxious components during the disabling period.

The foregoing description shows only preferred embodiments of the present invention. Various modifications are apparent to those skilled in the art without departing from the scope of the present invention. For example, the present invention can also be applied to an internal combustion engine of the carburetor type involving the use of a fuel cut-off feature. Therefore, the present invention is only limited by the appended claims and the embodiments shown and described are only illustrative, not restrictive.

Claims (13)

What is claimed is:
1. In combination with a system for controlling the main air fuel ratio of an internal combustion engine, a circuit for modifying the air fuel ratio supplied by said system to the engine, said circuit being responsive to an exhaust gas sensor, and means responsive to the control system for supplying air and fuel to said engine, wherein the amount of fuel supplied to said engine under the control of the control system is varied in response to various engine operating parameters supplied to the control system and the fuel flow is reduced while the engine is operating in response to particular engine operating parameters supplied to the control system, a system for disabling said modifying circuit while the fuel flow is reduced, said disabling system comprising:
means responsive to the particular parameters for generating an electrical signal having a duration corresponding to the duration of said fuel flow reduction; and
means insensitive to said electrical signal when the electric signal has a duration less than a predetermined duration and sensitive to said electrical signal when the electric signal has a duration longer than said predetermined duration for deriving a disabling signal for said circuit, said disabling signal having an interval commencing when said predetermined duration expires and terminating approximately at the end of the duration of said electrical signal.
2. A fuel control system as claimed in claim 1, wherein said disabling signal deriving means includes, means for introducing a delay time in response to the end of the duration of said electrical signal to cause said disabling signal deriving means to prolong said disabling signal to the end of said delay time.
3. A fuel control system as claimed in claim 2, wherein said disabling signal deriving means comprises:
a transistor having a base electrode connected to be responsive to said electrical signal to provide a low resistance path between emitter and collector electrodes;
a comparator having a first input connected to a reference potential; and
a series circuit including a resistor and a capacitor connected across the collector and emitter of said transistor, the junction of said resistor and capacitor being connected to a second input of said comparator, whereby said comparator generates a disabling signal having a duration that ranges from a delayed time from the beginning of said electrical signal to a delayed time after the end of said electrical signal.
4. A fuel control system as claimed in claim 1 wherein said disabling signal deriving means comprises means for generating a second electrical signal having a duration equal to said predetermined duration in response to the beginning of the first-mentioned electrical signal, and means for coupling an output signal of the sensor to said main air fuel ratio control system in the absence of said second electrical signal.
5. A fuel control system as claimed in claim 1, wherein said disabling signal deriving means comprises means for generating a waveform having a variable amplitude as a function of time in the presence of said electrical signal, and means for generating an output in response to the waveform reaching a reference level.
6. A fuel control system as claimed in claim 1, wherein said exhaust gas sensor generates a second electrical signal representative of the concentration of an exhaust composition in the gases from said engine, said modifying means comprising: means for generating a third electrical signal representative of the deviation of the second signal from a reference value representing a desired air-fuel ratio, and an integral controller including a capacitor for integrating said third signal, and gate-controlled switching means for providing a low resistance path across said capacitor in response to said disabling signal.
7. A fuel control system as claimed in claim 6, further comprising means for setting a DC potential and second gate-controlled binary switching means providing a first electrical path connecting said second signal to said integral controller when said switching means is in a first binary state in the absence of said disabling signal and providing a second electrical path connecting said DC potential to said integral controller when said switching means is in a second binary state in the presence of said disabling signal.
8. A fuel control system for controlling the ratio of an air fuel mixture supplied to an internal combustion engine, comprising exhaust gas sensor means for deriving a control signal for the air fuel mixture, a fuel controller responsive to the air fuel mixture control signal for controlling the amount of fuel supplied to the engine, said fuel controller being activated to reduce the supply of fuel to the engine in response to an engine parameter indicative of deceleration, said control signal having a first amplitude condition during deceleration to indicate that the mixture has been leaned and having a tendency to activate the controller to enrich the mixture, whereby an excessively rich mixture has a tendency to be supplied by the controller to the engine at the instant fuel is resupplied to the engine, and means for decoupling the control signal from the fuel controller in response to the fuel controller being commanded by the deceleration parameter to reduce the flow of fuel for at least a predetermined interval.
9. A fuel control system as claimed in claim 8 further including means for recoupling the control signal to the fuel controller only in response to the fuel controller being commanded to restore the flow of fuel for a designated interval.
10. A fuel control system as claimed in claim 9 wherein the fuel controller derives bi-level pulses having first and second amplitudes that respectively cause the flow of fuel to the engine to be reduced and restored, the amplitude of the control signal determining the duty cycle of the pulses, said means for coupling and decoupling including means for sensing the average value of the individual pulses, means for smoothing the average value over at least one pulse, and means responsive to the amplitude of the smoothed average value being respectively on first and second sides of a reference value for causing the coupling and decoupling, the smoothing and amplitude being such that the smoothed average value is on the one side of the reference value after the predetermined interval has been completed.
11. A fuel control system as claimed in claim 10 wherein the smoothing differs for the coupling and decoupling.
12. A fuel control system as claimed in claim 10 wherein the smoothing is greater for decoupling than for coupling, whereby the predetermined interval exceeds the designated interval.
13. A fuel control system as claimed in claim 8 wherein the fuel controller derives bi-level pulses having first and second amplitudes that respectively cause the flow of fuel to the engine to be reduced and restored, the amplitude of the control signal determining the duty cycle of the pulses, said means for decoupling including means for sensing the average value of the individual pulses, means for smoothing the average value over at least one pulse, and means responsive to the amplitude of the smoothed average value being on one side of a reference value for causing the decoupling, the smoothing and amplitude being such that the smoothed average value is on the one side of the reference value after the predetermined interval has been completed.
US05831061 1976-09-06 1977-09-06 Delayed response disabling circuit for closed loop controlled internal combustion engines Expired - Lifetime US4186691A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP51/105847 1976-09-06
JP10584776A JPS586052B2 (en) 1976-09-06 1976-09-06

Publications (1)

Publication Number Publication Date
US4186691A true US4186691A (en) 1980-02-05

Family

ID=14418396

Family Applications (1)

Application Number Title Priority Date Filing Date
US05831061 Expired - Lifetime US4186691A (en) 1976-09-06 1977-09-06 Delayed response disabling circuit for closed loop controlled internal combustion engines

Country Status (4)

Country Link
US (1) US4186691A (en)
JP (1) JPS586052B2 (en)
DE (1) DE2740107C2 (en)
GB (1) GB1554247A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355615A (en) * 1979-05-04 1982-10-26 Nissan Motor Company, Limited Air/fuel ratio control device for an internal combustion engine
US4365599A (en) * 1979-05-09 1982-12-28 Nissan Motor Company, Limited Open and closed loop engine idling speed control method and system for an automotive internal combustion engine
US4385596A (en) * 1979-07-19 1983-05-31 Nissan Motor Company, Limited Fuel supply control system for an internal combustion engine
US4406262A (en) * 1979-04-24 1983-09-27 Nissan Motor Company, Ltd. Engine idling speed control system and method for an internal combustion engine
US4450680A (en) * 1980-08-12 1984-05-29 Honda Giken Kogyo Kabushiki Kaisha Air/fuel ratio control system for internal combustion engines, having secondary air supply control
EP0163962A2 (en) * 1984-05-07 1985-12-11 Toyota Jidosha Kabushiki Kaisha Method and apparatus for controlling air-fuel ratio in an internal combustion engine
US4572126A (en) * 1983-10-18 1986-02-25 Robert Bosch Gmbh Apparatus for controlling the overrun mode of operation of an internal combustion engine
US4599695A (en) * 1984-05-25 1986-07-08 Motorola, Inc. Microprocessor transient interrupt system adaptable for engine control
US4660519A (en) * 1984-07-13 1987-04-28 Motorola, Inc. Engine control system
US4697559A (en) * 1984-11-30 1987-10-06 Suzuki Jodosha Kogyo Kabushiki Kaisha Method of controlling an air-fuel ratio for an internal combustion engine
US4760822A (en) * 1985-12-26 1988-08-02 Honda Giken Kogyo Kabushiki Kaisha Method for controlling the air/fuel ratio of an internal combustion engine with a fuel cut operation
US4964271A (en) * 1987-03-06 1990-10-23 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio feedback control system including at least downstream-side air-fuel ratio sensor
US5058556A (en) * 1990-01-23 1991-10-22 Toyota Jidosha Kabushiki Kaisha Device for determining activated condition of an oxygen sensor
US5228286A (en) * 1991-05-17 1993-07-20 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control device of engine
US6919047B1 (en) * 2000-10-10 2005-07-19 Corning Incorporated Reduction of nitrogen oxides in diesel exhaust gases and fuel injection system
US20100242569A1 (en) * 2009-03-26 2010-09-30 Ford Global Technologies, Llc Approach for determining exhaust gas sensor degradation
US20140288805A1 (en) * 2013-03-22 2014-09-25 Yamaha Hatsudoki Kabushiki Kaisha Fuel injection controller

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5827077Y2 (en) * 1976-12-14 1983-06-11
JPH033053B2 (en) * 1980-07-18 1991-01-17 Nippon Denso Co
JPH0413538B2 (en) * 1982-06-08 1992-03-10 Toyota Motor Co Ltd
JPH0510492B2 (en) * 1982-08-06 1993-02-09 Toyota Motor Co Ltd
JPH0244039Y2 (en) * 1984-03-30 1990-11-22
JPS60157946U (en) * 1984-03-30 1985-10-21

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903853A (en) * 1973-01-12 1975-09-09 Bosch Gmbh Robert Exhaust emission control system for internal combustion engines
US3916170A (en) * 1973-04-25 1975-10-28 Nippon Denso Co Air-fuel ratio feed back type fuel injection control system
US3919983A (en) * 1972-09-14 1975-11-18 Bosch Gmbh Robert Method and apparatus repetitively controlling the composition of exhaust emissions from internal combustion engines, in predetermined intervals
US3938075A (en) * 1974-09-30 1976-02-10 The Bendix Corporation Exhaust gas sensor failure detection system
US3938479A (en) * 1974-09-30 1976-02-17 The Bendix Corporation Exhaust gas sensor operating temperature detection system
US3939654A (en) * 1975-02-11 1976-02-24 General Motors Corporation Engine with dual sensor closed loop fuel control
US3990411A (en) * 1975-07-14 1976-11-09 Gene Y. Wen Control system for normalizing the air/fuel ratio in a fuel injection system
DE2647693A1 (en) * 1975-10-28 1977-05-12 Nissan Motor A method and control device for maintaining a preset air-fuel ratio of a mixture supplied to an internal combustion engine
US4040408A (en) * 1974-08-06 1977-08-09 Robert Bosch Gmbh System for reducing toxic components in the exhaust gas of an internal combustion engine
US4064846A (en) * 1975-02-19 1977-12-27 Robert Bosch Gmbh Method and apparatus for controlling an internal combustion engine
US4094274A (en) * 1975-08-08 1978-06-13 Nippondenso Co., Ltd. Fuel injection control system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1492284A (en) * 1974-11-06 1977-11-16 Nissan Motor Air fuel mixture control apparatus for internal combustion engines
US3971163A (en) * 1974-12-23 1976-07-27 Dow Corning Corporation Abrasive tape apparatus for contouring a flexible lens
JPS535331A (en) * 1976-07-02 1978-01-18 Nippon Denso Co Ltd Air-fuel ratio feedback control system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919983A (en) * 1972-09-14 1975-11-18 Bosch Gmbh Robert Method and apparatus repetitively controlling the composition of exhaust emissions from internal combustion engines, in predetermined intervals
US3903853A (en) * 1973-01-12 1975-09-09 Bosch Gmbh Robert Exhaust emission control system for internal combustion engines
US3916170A (en) * 1973-04-25 1975-10-28 Nippon Denso Co Air-fuel ratio feed back type fuel injection control system
US4040408A (en) * 1974-08-06 1977-08-09 Robert Bosch Gmbh System for reducing toxic components in the exhaust gas of an internal combustion engine
US3938075A (en) * 1974-09-30 1976-02-10 The Bendix Corporation Exhaust gas sensor failure detection system
US3938479A (en) * 1974-09-30 1976-02-17 The Bendix Corporation Exhaust gas sensor operating temperature detection system
US3939654A (en) * 1975-02-11 1976-02-24 General Motors Corporation Engine with dual sensor closed loop fuel control
US4064846A (en) * 1975-02-19 1977-12-27 Robert Bosch Gmbh Method and apparatus for controlling an internal combustion engine
US3990411A (en) * 1975-07-14 1976-11-09 Gene Y. Wen Control system for normalizing the air/fuel ratio in a fuel injection system
US4094274A (en) * 1975-08-08 1978-06-13 Nippondenso Co., Ltd. Fuel injection control system
DE2647693A1 (en) * 1975-10-28 1977-05-12 Nissan Motor A method and control device for maintaining a preset air-fuel ratio of a mixture supplied to an internal combustion engine
US4123999A (en) * 1975-10-28 1978-11-07 Nissan Motor Company, Ltd. Feedback air-fuel ratio control system for internal combustion engine capable of providing constant control signal at start of fuel feed

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406262A (en) * 1979-04-24 1983-09-27 Nissan Motor Company, Ltd. Engine idling speed control system and method for an internal combustion engine
US4355615A (en) * 1979-05-04 1982-10-26 Nissan Motor Company, Limited Air/fuel ratio control device for an internal combustion engine
US4365599A (en) * 1979-05-09 1982-12-28 Nissan Motor Company, Limited Open and closed loop engine idling speed control method and system for an automotive internal combustion engine
US4385596A (en) * 1979-07-19 1983-05-31 Nissan Motor Company, Limited Fuel supply control system for an internal combustion engine
US4450680A (en) * 1980-08-12 1984-05-29 Honda Giken Kogyo Kabushiki Kaisha Air/fuel ratio control system for internal combustion engines, having secondary air supply control
US4572126A (en) * 1983-10-18 1986-02-25 Robert Bosch Gmbh Apparatus for controlling the overrun mode of operation of an internal combustion engine
EP0163962A2 (en) * 1984-05-07 1985-12-11 Toyota Jidosha Kabushiki Kaisha Method and apparatus for controlling air-fuel ratio in an internal combustion engine
EP0163962A3 (en) * 1984-05-07 1986-03-12 Toyota Jidosha Kabushiki Kaisha Method and apparatus for controlling air-fuel ratio in an internal combustion engine
US4599695A (en) * 1984-05-25 1986-07-08 Motorola, Inc. Microprocessor transient interrupt system adaptable for engine control
US4660519A (en) * 1984-07-13 1987-04-28 Motorola, Inc. Engine control system
US4697559A (en) * 1984-11-30 1987-10-06 Suzuki Jodosha Kogyo Kabushiki Kaisha Method of controlling an air-fuel ratio for an internal combustion engine
US4760822A (en) * 1985-12-26 1988-08-02 Honda Giken Kogyo Kabushiki Kaisha Method for controlling the air/fuel ratio of an internal combustion engine with a fuel cut operation
US4964271A (en) * 1987-03-06 1990-10-23 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio feedback control system including at least downstream-side air-fuel ratio sensor
US5022225A (en) * 1987-03-06 1991-06-11 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio feedback control system including at least downstream-side air fuel ratio sensor
US5058556A (en) * 1990-01-23 1991-10-22 Toyota Jidosha Kabushiki Kaisha Device for determining activated condition of an oxygen sensor
US5228286A (en) * 1991-05-17 1993-07-20 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control device of engine
US6919047B1 (en) * 2000-10-10 2005-07-19 Corning Incorporated Reduction of nitrogen oxides in diesel exhaust gases and fuel injection system
US20100242569A1 (en) * 2009-03-26 2010-09-30 Ford Global Technologies, Llc Approach for determining exhaust gas sensor degradation
US8145409B2 (en) * 2009-03-26 2012-03-27 Ford Global Technologies, Llc Approach for determining exhaust gas sensor degradation
US20140288805A1 (en) * 2013-03-22 2014-09-25 Yamaha Hatsudoki Kabushiki Kaisha Fuel injection controller
US9745913B2 (en) * 2013-03-22 2017-08-29 Yamaha Hatsudoki Kabushiki Kaisha Fuel injection controller

Also Published As

Publication number Publication date Type
DE2740107C2 (en) 1984-04-12 grant
GB1554247A (en) 1979-10-17 application
DE2740107A1 (en) 1978-03-16 application
JPS586052B2 (en) 1983-02-02 grant
JP1178887C (en) grant
JPS5332235A (en) 1978-03-27 application

Similar Documents

Publication Publication Date Title
US5743086A (en) Device for judging deterioration of catalyst of engine
US4109615A (en) Apparatus for controlling the ratio of air to fuel of air-fuel mixture of internal combustion engine
US4029061A (en) Apparatus for controlling the air-fuel mixture ratio of internal combustion engine
US4344397A (en) Method for operation of a spark-ignited internal combustion engine and arrangement for execution of the method
US3916170A (en) Air-fuel ratio feed back type fuel injection control system
US4013054A (en) Fuel vapor disposal means with closed control of air fuel ratio
US3931808A (en) Altitude compensation system for a fuel management system
US3948228A (en) Exhaust gas sensor operational detection system
US4114570A (en) Start enrichment circuit for internal combustion engine fuel control system
US4167924A (en) Closed loop fuel control system having variable control authority
US4224913A (en) Vehicle air-fuel controller having hot restart air/fuel ratio adjustment
US4391240A (en) Internal combustion engine
US4251989A (en) Air-fuel ratio control system
US4256074A (en) Control system for closed loop mixture correction and split engine operation
US4184460A (en) Electronically-controlled fuel injection system
US4167163A (en) Sensor monitoring apparatus
US4169440A (en) Cruise economy system
US3782347A (en) Method and apparatus to reduce noxious components in the exhaust gases of internal combustion engines
US4155335A (en) Closed loop control system equipped with circuitry for temporarily disabling the system in accordance with given engine parameters
US4214308A (en) Closed loop sensor condition detector
US4213180A (en) Closed loop sensor condition detector
US5088281A (en) Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensor system
US3973529A (en) Reducing noxious components from the exhaust gases of internal combustion engines
US3960118A (en) Air-fuel ratio adjusting device in an internal combustion engine having a carburetor
US3916848A (en) Automotive-type internal combustion engine exhaust gas emission control system